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Free online calculators and converters for math, finance, health, and more. No sign-up. No ads. Just answers.

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Percentage Calculator

Percent of, percent change, and reverse percentage.

Tip Calculator

Split the bill and calculate tip per person.

Discount Calculator

Find the sale price after any percentage discount.

BMI Calculator

Body Mass Index with metric & US units.

Compound Interest

Future value with contributions and compounding.

Triangle Calculator

Area, perimeter, and Pythagorean theorem solver.

Circle Calculator

Area, circumference, diameter, and radius from any value.

Statistics Calculator

Mean, median, mode, range, and standard deviation.

Length Converter

Convert meters, km, miles, feet, inches and more.

Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin.

Volume Converter

Convert liters, gallons, cups, fluid ounces, and more.

Time Converter

Convert seconds, minutes, hours, days, weeks, and years.

Browse All Tools

Percentage CalculatorPopular
Percent of, percent change, and reverse percentage.
Open
Tip CalculatorPopular
Split the bill and calculate tip per person.
Open
Discount CalculatorPopular
Find the sale price after any percentage discount.
Open
GST / VAT Calculator
Add or remove tax from any amount instantly.
Open
BMI CalculatorPopular
Body Mass Index with metric & US units.
Open
Calorie Calculator
Daily calorie needs based on age, weight, and activity.
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Ideal Weight Calculator
Ideal body weight range by height and gender.
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Compound InterestPopular
Future value with contributions and compounding.
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Loan EMI Calculator
Monthly payment with amortization summary.
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Square Root Calculator
Square root, cube root, and nth root of any number.
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Fraction Calculator
Add, subtract, multiply, and divide fractions.
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Ratio Calculator
Simplify ratios and solve proportions.
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Quadratic Formula
Solve ax² + bx + c = 0 and find real and complex roots.
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Triangle CalculatorPopular
Area, perimeter, and Pythagorean theorem solver.
Open
Circle CalculatorPopular
Area, circumference, diameter, and radius from any value.
Open
Statistics CalculatorPopular
Mean, median, mode, range, and standard deviation.
Open
GCF & LCM Calculator
Greatest common factor and least common multiple.
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Exponent Calculator
Calculate base^exponent and nth roots instantly.
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GPA Calculator
Calculate GPA from letter grades and credit hours.
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Slope Calculator
Slope, distance, and midpoint between two points.
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Factorial Calculator
Calculate n!, permutations nPr, and combinations nCr.
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Logarithm Calculator
Calculate log base b, natural log (ln), and log10.
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Length ConverterPopular
Convert meters, km, miles, feet, inches and more.
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Weight Converter
Convert kg, lb, oz, grams, and more.
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Temperature ConverterPopular
Convert between Celsius, Fahrenheit, and Kelvin.
Open
Speed Converter
Convert mph, km/h, m/s, knots and more.
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Area Converter
Convert square meters, feet, acres, hectares.
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Data Storage Converter
Convert bits, bytes, KB, MB, GB, and TB.
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Volume ConverterPopular
Convert liters, gallons, cups, fluid ounces, and more.
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Time ConverterPopular
Convert seconds, minutes, hours, days, weeks, and years.
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Pressure Converter
Convert Pa, bar, psi, atm, mmHg, and more.
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Energy Converter
Convert joules, calories, kWh, BTU, and more.
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Fuel Economy Converter
Convert mpg, L/100km, km/L and more.
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Angle Converter
Convert degrees, radians, gradians, and turns.
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Date Difference
Find difference between two dates in days & weeks.
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ASCII Table
Search ASCII codes with dec/hex/bin values.
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Number Base Converter
Convert between binary, octal, decimal, and hexadecimal.
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About calctoolkit

calctoolkit provides free, accurate, and easy-to-use online calculators and unit converters. Whether you need to calculate a tip, convert units, check your BMI, or figure out compound interest, we have a tool for you. All calculators work instantly in your browser with no sign-up required.